Why am I jealous when I know he loves me?

My boyfriend has a customer across the country that will text him now and then about movies etc. It makes me uncomfortable and we've talked about it. He reassured me he just responds to stay friendly and milk her for the sales (more business, more money) And that when she's no longer his customer, there will be no more texts. I believe him and I trust him.

How can I feel less jealous when I know this is his job? He takes care of me, thinks I'm the most beautiful woman he's seen, he loves me so much. I have no reason to be jealous. He has female friends and I am ok with that, but his customer seems to overstep.

Why am I jealous when I know he loves me?
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